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Finding the Fourth Proportional to 81,012.64, 120,597.32 and 77,195.68

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Solution

The fourth proportional to 81,012.64, 120,597.32 and 77,195.68 is: 114,915.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,012.64 : 120,597.32 = 77,195.68 : x
  2. Step 2: Convert to fraction form
    81,012.64/120,597.32 = 77,195.68/x
  3. Step 3: Cross multiply
    81,012.64x = 120,597.32 × 77,195.68
  4. Step 4: Simplify right side
    81,012.64x = 9,309,592,123.58
  5. Step 5: Solve for x
    x = 9,309,592,123.58/81,012.64
  6. Step 6: Final answer
    x = 114,915.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.